Question

If you Don't study hard,you won't pass the exam.（

If you Don't study hard,you won't pass the exam.（改为同义句）
My mother went to work,but she didn't have breakfast.（改为同义句）
lt is three years since l joined the army.（改为完成时态）

Answer 1

You will pass the exam only if you study hard.
My mother went to work without her breakfast.
It has been 3 years since I joined the army.

这个要看知识点的，随便改同义句当然非常容易